The purpose of this study is to identify brain areas of activation associated specifically with the task of handwriting with the dystonic hand, in patients with simple writer's cramp. Simple writer's cramp can be defined by a patient exhibiting the symptoms only when writing and symptoms are not present in any other task performance. Specifically for this study, patients should be able to write for 20 seconds consecutively in a run. We plan to use functional magnetic resonance imaging (fMRI) to identify the pattern of blood oxygenation level-dependent (BOLD) activation in the brain when different tasks are performed by different limbs in healthy volunteers and patients with focal hand dystonia.